Update changelog based on model updates

Author: aws-sdk-python-automation

.changes/next-release/api-change-billing-69158.json

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+{
+  "type": "api-change",
+  "category": "``billing``",
+  "description": "Adds support for managing AWS account credits and billing preferences, including retrieving credit details, viewing per-month credit allocation history, redeeming promotional codes, and configuring credit sharing and billing preferences."
+}

.changes/next-release/api-change-logs-49224.json

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+{
+  "type": "api-change",
+  "category": "``logs``",
+  "description": "Added PutStorageTierPolicy and GetStorageTierPolicy APIs to Amazon CloudWatch Logs. Customers can now configure account-level Intelligent Tiering to automatically optimize log storage costs by moving infrequently accessed data to lower-cost storage tiers."
+}

.changes/next-release/api-change-mailmanager-76450.json

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+{
+  "type": "api-change",
+  "category": "``mailmanager``",
+  "description": "This release adds Smithy RPC v2 CBOR as an additional protocol alongside the existing AWS JSON 1.0. The SDK will prioritize its most performant protocol."
+}

.changes/next-release/api-change-opensearch-18555.json

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+{
+  "type": "api-change",
+  "category": "``opensearch``",
+  "description": "This release introduces Saved Object Migration APIs, enabling users to migrate dashboards, visualizations, index patterns, and other saved objects from a data source into an Amazon OpenSearch Service application workspace with configurable export filters and conflict resolution strategies."
+}